Tool/software:
Hi E2E Team,
We are currently using the TPA3112D2-Q1 in our design with the following configuration:
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Modulation Mode: BD
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Output Configuration: BTL(Right channel used, Left channel unconnected)
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Gain Setting: 36 dB
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PVCC Supply Voltage: 24V
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Switching Frequency: 400kHz
- Load: 33uH and 4 ohm in series
During testing, we observed the following behavior:
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At 200Hz input, with 588mVpp (208mVrms) signal, the output measured 36.4Vpp (12.87Vrms) and 10.5Ipp (3.71Irms).
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This results in an effective gain of approximately 35.8dB and a calculated output power of 47.7W.
The waveform appears clean and consistent at this frequency.
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However, when the input frequency is increased to 8kHz, we noticed:
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A reduction in output wattage
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A phase difference between voltage and current waveforms
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Distortion in the voltage waveform shape
We have attached the relevant waveforms for your reference.
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Could you please help us understand the possible reasons for this frequency-dependent behavior? Specifically, we are interested in knowing:
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Whether this is expected due to internal characteristics of the device at higher frequencies
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If layout, filtering, or load impedance could be contributing factors
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Any recommendations to mitigate this issue and maintain consistent output across a wider frequency range
Your insights would be greatly appreciated.
Schematic also attached with thistpa3116_Schematic.pdf -
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Thanks and Regards
Hari